Hypack generic offsets code#
The final differentially corrected precise positions were computed at 0.1 s intervals and exported in American Standard Code for Information Interchange (ASCII) text format. By analyzing the graphs, trajectory maps, and processing logs that GrafNav produces for each GPS session, GPS data from satellites with cycle slips were identified and excluded, and the satellite elevation mask angle was adjusted to improve the position fixes when necessary.
Hypack generic offsets software#
The final base station coordinates were imported into GrafNav software version 8.5 (NovAtel Inc.), and the kinematic GPS data from the survey vessel were post processed to the concurrent static GPS data from the nearest base station to minimize vertical error. Any processed GPS sessions in which the average ellipsoid value was greater than 3 standard deviations (σ) from the mean were excluded from the final coordinate calculations. All OPUS solutions were entered into a spreadsheet, and time-weighted ellipsoid values for each station were calculated for the duration of the occupation. All base station sessions were decimated to 30 s and then submitted to OPUS via the online service. The coordinate values for each GPS base station (B166, 189A) are the time-weighted averages of base-station data processed through the National Geodetic Survey's (NGS) On-Line Positioning User Service (OPUS). Single-Beam Bathymetry Data Collected in 2015 From Grand Bay, Alabama-Mississippi
0 kommentar(er)
